Arc-light electrode or pencil.



I. LADOFP.

ARG LIGHT ELEGTRODB 0R PENclL.

APPLICATION FILED I'BB.12,'19-08 Patented Apr. 9, 1912.

ISADOR LDOFF, F CLEVELAND, OHIO, ASSIGNOR'OF THIRTY ONE-HUNDREDTHS T0 PHILIP C.l P IECK,v 0F NEW YORK, N. Y. l

vRC-LIG'HT ELECTRODE 0R PENCIL.

Iatented Apr. 9, 1912.

Application filed February 12d, 1908. kSerial No. 415,490.

To all whom t mag/concern: f

Be it known that I, IsADoR Lavori, a citizen of the United States, and a resident of the city of Cleveland, county of Cuyahoga, and State of Ohio, have invented certain new and useful Improvements in ArcLight Electrodes or Pencils, of which the following is a specification, reference being had to the accompanying drawings, in which- Figure l. is an elevation of one of my` improved pencils, and Fig. 2 a central longitudinal section of Fig. 1.

My .present invention relates to electrodes or pencils used in the production of' the arc light, and its objects comprise facilitation and economy of construction under certain conditions, steadying of the arc, longevity of the pencil, etc. l

I attain these objects by my novel con`- struction, which is as follows Into a container or sheath, preferably of tubular form as shown, and possessing preferably good electrical conductivity, as for instance-iron, I pack` powdered materials, to wit, a proportion of titanic material, as for instance titanium oXid, 'liO2 30%, and a proportion of powdered me'tal having higher electrical conductivity than said titanic material, as for instance iron 70%. The bottom of the tube is provided with a plug or stopper a to retain the powdered contents. The tube is then filled with' the latter, which is preferably tightly packed therein, care being taken to first mix the respective powdered ingredients as thoroughly and homogeneously as possible. The open end of the tube may then conveniently be closed by fusion in the arc of the powdered contents near the top, thus forming a cap adhering to the tube and sealing the powder beneath to prevent its loss during transportation.

My pencils are preferably burned as lowers which insures retention of the powdered contents during arcing. lInstead of using powdered iron miXed-.-with powdered oXid of titanium, a powdered alloy of iron and titanium, ferr`o-titanium, may be substituted with good results.

Letters PatentNo.. 840,634 were, on thej 8th day of January 1,907, granted to me for? arc light electrodes' containing ferro-tita-` nium, and I have application now pendingy filed June 18th1904, SerialNo. 213,065 for Letters Patent to cover an arc light pencil composed ofl a titanic material, as oXid of titanium, conglomerated withmetal having greater electrical "conductivity, as iron.

I am aware that arc light pencils have been vheretofore made byfilling metallic, including iron, tubesv with powdered ingredients including titanic material and oxids of metals including oXid of iron, and Ido not wish -to be understood as claiming that my present yinvention embraces any such devices, an essential characteristic of my present invention being the use in such a tube of powdered titanic material'intimatel'y mixed with powdered metal in elemental state,

which for many purposes, is, I have discovered, of advantage.

What I claim as new and desire to secure b v Letters Patent is the following, viz

l. An arc light electrode comprising an iron tube containing a mixture consisting of powdered metallic iron and a powdered titanic substance.

2. An arc light electrode consisting of an iron tube containing a mixture consisting of powdered metalllc iron and powdered cxid of titanium intimately and homogene 

